Filtering apparatus.



No. 812,981.. PATENTED FEB. 20, 1906.

K. KIEFER. FILTERIN G APPARATUS.

APPLICATION FILED MAB.6| 1.903.

2 SHEETS-SHBBT 1.

g i 117 T A D No. 812,931. I PATBNTED FEB. 20, 1906.

K. KIEFER.

FILTERING APPARATUS.

'APPLIOA'IION FILED MAR. 6. 1903 2 SHEBTS-SHEET 2.

WITNESSES: INVENTUR W. n I i 40. 5 455 a KARL KIEFER, or ciNomN rnomo.

FlLTERlNG APPARATUS.

Speciflcatioii of Letters Patent.

Patented Feb. 20, 1906. I

Application filed March 6, 190.3. Serial No. 146,596.

i To alt whom it may concern:

Be it known that I, KARL KIEFER, a citizen of the United States,residing at Cincinnati,

in the county of Hamilton and State of Ohio, have invented. usefulImprovements in a-Filter, of which the following is a specification.

The purpose of the present invention is to devise a more simple andadvantageous 'construction for the filter-plates asshown in my PatentN;579',586, granted to. me March 30, 1897. It also shows numerous otheradvantages derived by set forth in detail.

Figure 1 showsa cross-section through an assembled filter. Fig. 2'showsa cross-section through one of the new .filterplates. Fig. 3 is a topview of the empty filter-plate. Fig. 4 is a cross-section through amodified form of'the new filterlate. Figs. 5 and 6 are views of the samep ate.

The general arrangement of the filterplates and the Working of same aresimilar to those described in Patent No. 579,586. I therefore do notneed to reeat the detailed description, especially as I ave retained thesame reference-letters as far as possible. The liquid to be filtered,however, is admitted to the filter layers fromethe peripheries of thefilteringplates. All filterplates are there- 0 fore placed into anair-tight drum or casing R, which is hermetically covered by cover A, anarrangement similar to the arrangement described in Letters Patent 'toPiefke, No. 335,040, and often used by other inventors 'and easilyunderstood. As it is desirable to place as many filter-plates aspossible into thefilter-drum R in order to get as much filtering-surfaceas possible, it is necessary that the filter-plates should be made as liht as possible and that they should not ta e up much room in the filter.The complexity of the filter-plates, however, has necessitated thecasting of them in brass and the turning of them subsequently on thelathe, this making them costly, heavy, and occupying considerable spacewithin the filtering-drum R. My new plate, as shown in Fig. 2, consistsof a sheet-metal pan-like part Dand a cast-1netal hub B, soldered to thepan pcrlectlv tight. This hub is perforated with. radial holes h. In thebottom part of pan D there is a woven sheet of metal gauze W. This sheetof metal gauze fills two purposes. In the the novelconstruction, as

' the filtering-machine.

' first place, it is fine enough that it is fiber+re-' taining. By thewords fiber-retaining wire screen I understand a fine and pliable wirescreen with meshes fine enough to retain the fibers of the filter massif the filter mass ismixed with .water to a thin mixture, such as isusually usedin pulp-filters, before compressing, and thrown upon suchscreen. The meshes of such a screen are from thirty to fifty tot'heinch, is often Woven in armanner called twilled, but is alwayspliable-and hardly exceeds althickness of one sixteenth of an inch,which is high enough to. give sufiicient room between it and the bottom01 the sheetmetal pan D fpr the clear liquid to flow to the center ofthe pan through the holes h of hub B, connecting from there tothe outletn of This new construc tion especially obviates complicated outletconduits, which used to take quite agood deal of space from thefiltering-drum. 3

The plate D showsa ring-shaped offset 9, in'which neighborhood thefilt rmass is seen to be compressed more than over the wire mat W. The hubalso shows an offset 9 'forthe compression of the filtering mass. Theseoffsets 9 and 9 serve to form a sort of gasket,

preventing the cloudy liquid from communicating with the wire mat W, andtherefore to prevent it from getting access to the conduits for theclear liquid. A wire mat E is placed on top of the filter, mass, andthis wire mat,

in conjunction with the lower part of the sheet-metal pan D, forms theconduit for the cloudy liqui a In Figs. 4, 5, and 6 isshown amodification of filter-plate D' whereby it. can be dispensed with wiremat E. It is seen from Figs. 4 and 5 that longitudinal ribs 15 arepunched into the bottom part of the sheet-metal pan D. They are seen incross section in Fig. 6, and they will hold down the filter mass '5 andallow the liquid to be filtered to pass between them. They also serve ascollectors. for the clear liquid underneath the wire mat W. They areseen to connect with holes h'of the metal central hub Bin Figs. 5 and 6,and they metal pan D. Fig. 1 shows a series of plates, as shown-in Fig.2, assembled ready for operation. I have shown only the three lowestplates and the top plate in the drawings; but the inter- I00 ultimatelyserve stifl'en the'sheet- 3O Qto secure by Letters Patent, is-

mediate plates are to be thought asjexisting;

It will be seen that the top cover A presses directly on the top plateD, also closes up drum R by means of a circular gasket 3", therewithmaking the whole arrangement airtight. In order to facilitate theexecution of these two purposes i. 'e. bearingdowri upon the'system'ofplates and making an air-tight closure of drum-R'I have arranged coverA;

so that it is sunk into the drum 1%,30 that it' .will bear for quite aconsiderable distance upon the plates D and guide itself centrallywithin drum R before gasket 3 is compressed.

Cover A therefore acts in a certain sense as a piston at first. Y f

Figs. 1 and 3 show the application of a step- S for a greaterconvenience of theman'han dling the filtering-machine. ,Fig. 1 showstop.-- These steps, however, have. anotherthe cross-section of the stepand a'bracket 17, carrying it, in dottedlines. Thebra'cket 17 is carriedby thetwo uprights U of the filterframe. Fig. 3 shows the whole step,bracket,'and uprights as viewed from the purpose. They are forprotecting the drum R from collision during the using 'andoperar.

'tion of the filter. They also protect the inlet and outlet faucets F'a'ndF from harm. They also serve as a shelffor tools, gaskets, &c.-

filtering layer of compressed pulp.

What I claim as my inyention, and desire 1., In a filter, the combnation of a pan hay in a" lane im erforate bottom, of a sin le :3 p P gwoven mat in contact 'on one side with said bottom, on the other side incontact with the 2. In a filter, the eombinat'on witha pan having aplane imperforate bottom, of a sin gl e woven'fiber-retaining mat,incontact on one side with said 'bottom, on the other sidewith thefiltering layer of compressed pulp.

In a filter, in combination, a filter layer of compressed pulp ing intosaid filter layer ofa width at least equal to the thickness of thefilter layer at the edge, said ring-shaped surfaces tightly. connectedto the inner side of the pan next to the clear-1i uid conduit. 4. In afilter, a filtering layer within a pan, in combination. only with asingle woyen fiberretaininglwire mat between lter layer and pan, wit

5. In a filter the combination of a filter layer within a circular pan,said pan havin tightly, connected to its inside ring-shape surfaceshigher than the'bottom and projecting into the filter layers, incombination with means for supplying unfiltered lid uid to the filterlayers, sai surfaces of a wi 'th at least ual to the thickness of thefilter layer at the e'and conductin the filtered li uid away. g g 1siaesi I contained within a circularpan, havin ring-shapedsurfacesprotrud-,

means of supplying cloudy liquid. to the filtering layer.

6. In a filter, the combination with a single woven mat in contact witha filtering layer on one side, on the other side with a planeimperforate surface, ofmeans for circulating liquid through filter layerand mat.

7. Ina filter, the combmation with a single Woven'fiber-retaining mat incontact with a filtering layer on one side, on the other side a plane imerforate surface, of means forcirculating i uid through filter layer andmat.

8. In a lter, the combination of a filtering layer of compressed pulpwithin a circular pan having ring-shaped surfaces higher than thebottom, and projecting into the filtering layers, in combination with aWoven mat be tween filtering layer'and bottom'of pan, with filterlayer." i

9. In a'filtenthe combination of a filtering layer ofeompressed pulpwithin a circular means'of supply ng unfilteredliquid to the pan, thepan-like partof an equal thickness throu hout except the central part,having rin Ts aped surface's'higher'than the bottom,

- nessthroughout, except the central part,

horizontal ring-shaped surfaces projecting into the filtering layers, incombination with l a woven mat between filteringlayer and b'ot-.

tom of pan,--with means of supplying unfilteredliquid to thefilterlayers.

11. In a filter, the combination of a filter lar pan, the pan-like partof an e ual thickness throughout, except'the centra' art, havingail-upturned edge and a meta hub and ring-'shapedsurfaces hi her thanthe bottom and projecting into t e filtering layers',,in

.ing layer of compressed pulp within'a circucombination witha woven matbetween filtering'layer and bottom of with means for supplyingunfiltered liquid to the filtering ayer.

12. In a'filter-, the combination of a filtering layer of compressed pullar pan-having an upturne edge .and cylindrical hub in center,smooth-bottom and ringshaped surfaces higher than the bottom and proectinginto the filtering-Slayers, in combi- I nation with a wovenfibenretaining 'mat between filtering layer and bottom of pan, withmeans of supplying unfiltered liquid to the filter layers.

13, .In a filter, the edmbinaiii of a simfaces higher than the bottomand projecting into the filtering layers, in combination with within acircu- IIJS ing 'l ayerof compressed pulp, with a circular sheetmetalpan having an upturned edge. and smooth bottom, and ring-shaped sur- 3 awoven mat between filtering layer and bot this border and tightlyconnectedfiherewitha I tom of pan, with means of supplying unfilsmoothring-shaped surface" at least as Wide- 65 'tered liquid to the filterlayer. as the thickness of the filtering layer, a filter 14. In afilter, the combination with a selayer of compressed pulp within the pan1n 5- ries of circular filter elements, of an external contact with saidperipheral ring shaped drum and of. a cover partly projecting into edge,but spaced apart elsewhere from the the drum, said cover having acylindrical pan by means constituting a'liquid-way, and 7 part smallerthan the drum and guided by of means tosupply the liquid-waywith liquid.the drum, and said cylindrical part of cover. 22'. The combination in afilter, of a pan io' being of sufficient height to allow the useofhaving a-vertical central border, next to this I the cover asmeans ofcompressing the filter border and tightly connected therewith aelements. I smooth ring-shaped surface at least as wide 75 15. Thecombination with a disk-shaped as the thickness of the filtering layer,a filter filtering layer of compressed 'pulp contained layer ofcompressed pulp within the pan in I within a pan having a clear-liquidway in its contact with said central ring-shaped edge,

bottom, of a smooth surface tightly attached but spaced apart elsewherefrom. the pan by to the pan "outside of said clear-liquid-Way meansconstituting a liquid-way, and of 80 and in intimate contact with theedge of said means to supply the liquid-way with liquid. filtering layerand parallel thereto, said 23. The combination in'a filter, of a pansmooth surface of a width at least equal to having a vertical peripheralborder, and next I the thickness of the filter layer at the edge. tothis border and tightly connected there- 16. In a filter, thecombination of a base with, and parallel to the bottomof the pan, 5 withtwo uprights, of a sheet-metal drum smooth ring-shaped surfaces of awidth at with a cover, of a projecting-ring of greater least equal tothe thickness of the filter layer 25 strength than the sheet metal drumand at its ed e, a filter layer of compressed pulp higher than the base,and adapted to protect within t e pan in contact with said ring- I thesheet-metal bottom from injury substan shaped edge, butspaced apartelsewhere 90 tially as described. Y from thepan by means of aliquid-conductor, 17. In a 'filter, the combination of a base of meanspressing said filter layer-at all times with two uprights, of asheet-metal drum against said smooth ring-shaped surfaces, I I I with acover, of a protecting projection of 24. Thecombination'inafilter, of apan greater strength than the sheet-metal drum having a verticalperipheral border, and next 95 and higher thanthe base, and adapted toto this border and tightl connected thereprotect the sheet-metal bottomfrom injury -wi'th,and parallel to the ottom of the an, substantially asdescribed. smooth ring-shaped surfaces'of a widt at 18. ,In a filter,the combination of a base least equal to the thickness of the filterlayer with two uprights, of a sheetmetal drum at its ed e, a filterlayer of compressed pulp 100 with a cover, of a protecting-ring ofgreater within t e--pan in contact with said ring-- strength than thesheet-metal drum rigidly shaped edge, but spaced apart elsewhere 4fastened. to the uprights, higher than the from the pan bymeans ofawire-screen liquidbase, and adapted to protectthe sheet-metalconductor, of means pressing said filter layer body from injury. at alltimes against said smooth ring shaped 5 I 19'. In afilter,incombination,afilter layer surfaces. I

of compressedpu lp contained within a circu- 25. The combination in afilter, of a pan lar pan'having ring-shaped surfaces in intihaving avertical peripheral border, and next mate contact with the edges of thefiltering "to this border and tightly connected therelayer, saidring-shaped surfaces parallel to with, and parallel to the bottom of thepan, I I the filtering layer and of a width at least as smoothring-shaped surfaces of a width at wide as the thickness of thefiltering layer at least equal to the thickness of the filter layer itsedge. II 1 i c at its ed e, a filter layer of compressed pulp- 20. Thecombination-with a disk-shaped within t ej-pan in contact with saidringfiltering layer of compressed pulp, of an imshaped edge, but spacedapart elsewhere 15 perforate metal surface separating it entirely fromthe panby means of'an' o en-work liqfrom the neighboring filteringlayer, of suruid-conductor, of means pressing said vfilter faces ofintimate contact along the edges of layer at all times against saidsmooth ring-" sai'd filtering layer. between the filter layer shapedsurfacesl v I and imperforate surfaces, said edges ofcon- 26. Thecombination in affilter, of a pan 'I tactof a width at least equal tothe thickness 1 having a vertical peripheral border, and next of thefiltering-surface at the point of contact to this border and tlghtlconnected there- 6 and tightly attached to the said imperforatefl with,and parallel to the ottom of the' an,

separating-surface. smooth ring-shaped surfaces of'a-widt at I 2i. Thecombination in afilter, of a pan least equal to the thickness of thefilter layer having a vertical peripheral border, next to at its edge, afilter laye'r'of compressed pulp I Within the pen in eontact with said-ring- VVitnes my hand, this 21st day 01 January, shaped edge, butspaced apart elsewhere 1903, at the city of Cincinnati, in the county 1cfrom the pan by means of 'an open-Work liq- 0f Hamilton and State ofOhio.

uid-conductor ofv neans PIQSSHIQ said filter r 1 layer at all tinlesagainst said sfilooth ring- 3 KARL "shaped surfaces eonsistingef Wirescreen .Witnesses: -'pressed against by the neighboring filter ele- G.W. WERDEN,

v ment.

CHARLES L. RICHTER.

